Turkey’s leading activist Osman Kavala, who at the weekend marked his 1,600th day in prison without conviction, will appear in court Monday in a case that has strained Ankara’s ties with the West. The philanthropist is accused of financing 2013 anti-government protests and playing a role in a coup plot against President Recep Tayyip Erdogan. Turkey has kept Kavala in prison since 2017 in a huge prison complex on the outskirts of Istanbul in defiance of a European Court of Human Rights ruling to release him. Last month, the Council of Europe (COE) launched rare disciplinary action against Turke…